Hey Loura Code Sandbox

const aaa = document.getElementById('AAA');
const aa = document.getElementById('AA');

// Code adapted from https://stackoverflow.com/a/9733420
const RED = 0.2126;
const GREEN = 0.7152;
const BLUE = 0.0722;

const GAMMA = 2.4;

function luminance(r, g, b) {
  var a = [r, g, b].map((v) => {
    v /= 255;
    return v <= 0.03928
      ? v / 12.92
      : Math.pow((v + 0.055) / 1.055, GAMMA);
  });
  return a[0] * RED + a[1] * GREEN + a[2] * BLUE;
}

function contrast(rgb1, rgb2) {
  var lum1 = luminance(...rgb1);
  var lum2 = luminance(...rgb2);
  var brightest = Math.max(lum1, lum2);
  var darkest = Math.min(lum1, lum2);
  return (brightest + 0.05) / (darkest + 0.05);
}

for (let b = 0; b < 255; b += 1) {
  for (let g = 0; g < 255; g += 1) {
    for (let r = 0; r < 255; r += 1) {
        let white = contrast([255, 255, 255], [r, g, b]);
        let black = contrast([0, 0, 0], [r, g, b]);

if(white > 3 && black > 3 && Math.abs(white-black) > 3.99999) {
            aa.insertAdjacentHTML('beforeend',`<tr>
                <td>${'rgb(59, 85, 161)' == `rgb(${r}, ${g}, ${b})` ? '⭐' : ''}</td>
                <td style="background-color:rgb(${r}, ${g}, ${b});color:canvastext">rgb(${r}, ${g}, ${b})</td>
                <td style="background-color:white;color:rgb(${r}, ${g}, ${b})">${white}</td>
                <td style="background-color:black;color:rgb(${r}, ${g}, ${b})">${black}</td>
                </tr>`);
        }

if(white > 4.5 && black > 4.5 && Math.abs(white-black) < 0.000005) {
            aaa.insertAdjacentHTML('beforeend',`<tr>
                <td>${Math.abs(white-black) < 0.000001 ? '⭐' : ''}</td>
                <td style="background-color:rgb(${r}, ${g}, ${b});color:canvastext">rgb(${r}, ${g}, ${b})</td>
                <td style="background-color:white;color:rgb(${r}, ${g}, ${b})">${white}</td>
                <td style="background-color:black;color:rgb(${r}, ${g}, ${b})">${black}</td>
                </tr>`);
        }
    }
  }
}
window.parent.postMessage({
  'msg': 'done'
}, "*");